Eligibility
Step 1 of 7
The número de la Seguridad Social (NUSS, also called the número de afiliación or NAF) is the number the Spanish social security system uses to identify you. You need it before you can start work, and your regional health service uses it to issue your health card.
You can apply at any time, and the whole process is done online.
Anyone who does not already have a número de la Seguridad Social can apply.
There are three situations, each with slightly different requirements.
You are an adult applying for yourself
The standard route explained in the steps that follow.
You are an emancipated minor
Same route, plus the document proving your emancipation.
You are applying for a child
The application must be submitted by the mother, father or legal guardian, using the guardian's own identity and selfie. See the separate document list in the next step.
Before you start: check you do not already have one
You may already have a NUSS without knowing it, for example if you have worked in Spain at any point or were covered by the Seguro Escolar. If you are not sure, check in your área personal on the Seguridad Social portal before applying, rather than submitting a duplicate request.
Use Google Chrome or Microsoft Edge. Other browsers frequently fail partway through this trámite.
Documents you'll need
Step 2 of 7
Have everything ready before you start, and fill in the TA.1 form in advance.
Everyone
- Your identity document (passport, DNI, NIE or TIE).
- A mobile phone number and an email address you can access during the process.
- Your habitual address in Spain, including postcode.
- A device with a camera, or a phone you can switch to via QR code.
- Modelo TA.1, downloaded and completed before you begin. Download modelo TA.1
Applying for a child
In addition to everything in the list above:
- The parent or guardian's own personal details, selfie and photo of their identity document.
- Modelo TA.1 completed with the child's details.
- A photo of the child's DNI, NIE or passport.
- A copy of the libro de familia, or a document proving parental authority or guardianship.
Emancipated minors
In addition to everything in the list above:
- The document proving emancipation.
Choose how you will identify yourself
Step 3 of 7
Open the trámite page and select Solicitar NUSS. The site then asks you to pick an identification method.
Open the Importass trámite pageCard A - with Cl@ve Permanente, Cl@ve Móvil, DNIe or certificado electrónico
Choose the first option. You identify yourself directly and skip the selfie and document upload steps entirely.
If you are applying on someone else's behalf and are registered as their apoderado, use Solicitar NUSS como apoderado instead.
Do not have one yet?
A certificado digital or Cl@ve makes this trámite, and most other Spanish administration, considerably simpler. We can walk you through getting one.
Card B - none of the above
Choose Ninguno de los anteriores. You will identify yourself with a selfie and photos of your identity document instead. The photo and document-upload step that follows applies only to this route - Card A skips it entirely.
SMS identification is not available to you here
The Seguridad Social can only identify you by SMS if you already have a NUSS, which is the thing you are applying for. If you do not have Cl@ve or a certificado digital, the selfie route is the correct one.
Confirm your email
Step 4 of 7
Enter your email address and select Confirmar correo. A confirmation code is sent to that address. Enter the code on the site to continue.
The justificante and any status updates go to this address, so use one you will keep access to.
Fill in your personal details
Complete every box, including the ones marked optional.
- Tipo de identificación:
- select the document type you are using, for example Pasaporte.
- Número de identificación:
- the document number exactly as it appears on the document.
- Segundo apellido:
- if you do not have a second surname, enter X.
- Fecha de caducidad:
- the expiry date of your document.
Take a selfie with your document
Step 5 of 7
The portal asks for a live photo of you holding your identity document, showing the front of the document.
If your computer has a webcam you can take it there. If not, select Haz clic aquí under Hacer foto to get a QR code and take the photo on your phone instead.
Hold the document close enough to the camera that it is clearly readable and clearly yours.
Upload your identity document
Upload clear images of the document. JPG or PNG.
- Passport: the front cover in the first box, and the inside page showing your photo and details in the second.
- DNI, NIE or TIE: the front in the first box and the back in the second.
Check the uploaded images before continuing. The portal will let you proceed with an unreadable image, and the request is then rejected later. Make sure nothing is blurred, cut off, dark or washed out by glare. If an image is wrong, use Eliminar y volver a subir.
Complete the request details
Step 6 of 7
- Código postal:
- your postcode.
- Medio de comunicación:
- Correo for email, or SMS for phone.
- Prefijo:
- your country dialling prefix, without the + sign.
- Número de teléfono:
- your phone number.
- Categoría:
- Obtener número de Seguridad Social.
- Trámite:
- Obtener el número de Seguridad Social.
- Motivo de la solicitud:
- state briefly why you need it, for example that you need the number in order to start work.
Under Documentos, attach your completed modelo TA.1 in the Solicitudes row and select Subir documento. If you are applying for a child, attach the additional documents you gathered earlier as well.
Review and submit
Check everything, then select Doy mi conformidad followed by Continuar. The request is not submitted until you have done both.
Download the justificante de presentación before closing the page. It confirms the request was received and lists everything you attached. Keep it.
Receiving your number
Step 7 of 7
The número de la Seguridad Social is sent to the email address you registered. If you need it for a job, forward it to your employer as soon as it arrives.
If any page fails to load during the process, switch to Google Chrome or Microsoft Edge and start again.
For questions about your specific situation, the Seguridad Social has an online queries service. Seguridad Social queries service
Sources
Official sources
- Solicitar el Número de la Seguridad Social, Tesorería General de la Seguridad Social
- Official informative guide (Spanish)
- Modelo TA.1
Last verified: 4 August 2026
This guide reflects the official process at the date shown. Procedures, forms and portal screens can change.
Where we can help
The application itself is mostly form filling. What stalls people is everything around it: an identity document photo the system keeps rejecting, a TA.1 filled in incorrectly, applying for a child without the right proof of guardianship, or a request that goes quiet with no way to chase it.
If you would rather not handle those, we prepare the paperwork, submit on your behalf and follow it through with you.
See our social security number service- Voorwaarden
- Documenten
- Identificatie
- Importass
- TA.1-formulier
- Indienen
- Je nummer
Je hebt alles wat je nodig hebt om je NUSS aan te vragen
Je hebt elke stap van de procedure doorlopen. De aanvraag zelf dien je in op het Importass-portaal, en daar krijg je het nummer terug.
Wat je hebt afgerond
- Voorwaarden bevestigd
- Documenten verzameld
- Identificatiemethode gekozen
- Aanvraag ingediend via Importass
Of geef het uit handen
EnterSpain en gecontroleerde lokale aanbieders kunnen dit van je lijst halen.
Aanmelding bij de sociale zekerheid
Je socialezekerheidsnummer is wat een werkgever nodig heeft om je aan te melden, waarmee je je als autónomo vestigt en waarmee publieke zorg opengaat.
Zorgregistratie voor gezinsleden
Meld je partner, kind of afhankelijke familielid aan op jouw publieke zorgdekking.
Praat met een adviseur
Plan een gesprek als je liever iemand je documenten laat controleren voordat je ze indient.